Perhaps you should try some spelling variations:
quoc ban » quoc bao, quoc lan, quoc quan
hieu van » hieu va, thien van, lieu va
manh hai » lanh hai, minh hai, thanh hai
cua tre » cua te, cua triet, dua tren
thu sac » thu sach, thu san, thu xac
van cam » van nam, van lam, van cau
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cuu tre » cau tren, cau treo
sac ky » cac ky, sai ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky lang xa hoi. hieu van cam ((quoc ban) or (duc va)) manh hai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky lang xa hoi. hieu van cam ((quoc ban) OR (duc va)) manh hai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky lang xa hoi. hieu van cam ((quoc ban) or (duc va)) manh hai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: thu sac ky lang xa hoi. hieu van cam ((quoc ban) or (duc va)) manh hai ((cua tre) OR (cuu tre))*.